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You are using a extruded base tubular shaped powder which is going to be a headache if you want to load any quantity, the "cutting" you are experiencing was enough for me to go with ball powders when loading 308 Check your data - most if not all IMR powder is tubular, look for Hodgdon - H414 or H380 is ball, also Winchester 760 is claimed to be very favorable in the 270 according to good 'ol Lyman, hope this helps....
